That can hide what it originally is: a legal document.
A ketubah is a marriage contract
Britannica defines the ketubba, or ketubah, as the formal Jewish marriage contract written in Aramaic and guaranteeing the bride certain future rights before marriage.
That is the essential starting point. The ketubah is not just decorative ritual. It is law.
The document was designed to protect the woman
Britannica explains that the ketubah was introduced to protect a woman's rights and to make divorce financially costly for the husband.
That purpose is worth naming clearly. The document arose because Jewish legal tradition recognized a structural imbalance and tried to limit abuse.
The ketubah has legal and symbolic force
Even when later communities decorate and publicly display the ketubah, its importance comes from the obligations it records. A beautiful ketubah can still be a serious contract.
Why it still matters
The ketubah still matters because it shows Judaism trying to tie marriage to enforceable responsibility rather than romantic sentiment alone.
The shortest accurate answer
A ketubah is the Jewish marriage contract that records the husband's obligations and protects the wife's rights in marriage, widowhood, and divorce.